Pro Sites: blank screen (WSOD)

On a fresh installation when clicking the "Pro Upgrade" link I am redirected to wp-admin/admin.php?bid=3 which is a completely blank screen. I am a Drupal guy and don't know much about wordpress so I might be missing something obvious to others...

Yes, I installed Wordpress 3.3.1
It's a Multisite installation located on the root directory for that domain.
I just re-uploaded the wordpress files (just to be sure) and the error remains.

It would be a lot easier if there were some errors reported instead of that blank screen.

I tried adding
ini_set('display_errors','1');
ini_set('display_startup_errors','1');
error_reporting (E_ALL);
inside the admin.php file (both in /wp-admin/admin.php and /wp-admin/network/admin.php) but still wouldn't get anything, any ideas on how to enable error reporting so that I can debug it?

Just a question because I can't get a definite answer on this one...
I remember a few years back that on wordpress-mu multisite plugins had to be on a separate folder called mu-plugins. Is this still the case with wordpress 3?

After a few hours and lots of installations I concluded that the error occurs only when Wordpress has been installed using the Softaculous installer. I don't know why or how but that is the case.
I was too bored to install it manually and used that in the beginning so I've learned my lesson.

@aristath
If you have a clean install of WordPress and the latest version of Pro Sites installed, I don't see why you would get that error. I have the exact same setup and I am not able to replicate your error.

I think it is best to also ask for feedback from the Developer. And the links that @marikamitsos provided are very good and should also shed some light on what might be the problem.

It's all good and well to edit wp-config.php, but I would like to know what is causing the problem so that it can be avoided.

Let's see if the Developer has any feedback.

Be back shortly.

Have a good day!

GinaB

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@marikamitsos
Thank you for your input. As always you are fast and efficient.

You also mentioned that you are a Drupal guy. So you know your cookies.... No need to use any Softaculous or SimpleScripts or whatever. You'll find that installing WordPress is the easiest thing in the world.

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